Callmanger 3.3.2 One-Way voice on call transfer.

I'm running into a problem with intermittent one-way voice on call transfer with Callmanager 3.3.2 SPB. It happens on calls from the PSTN. I have a 2620 with a NMHDV-1T1-24 running MGCP. IOS ver 12.2.13T.

Example:

A person calls in from the PSTN via the PRI into ext 6300. The calling party and the called party can both hear each other fine. When the user at ext:6300 transfers the call to ext:6399 the user at ext:6399 can hear the calling party but the calling party can not hear the user at ext:6399.

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